/*
 * Copyright (C) 2024 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.preview.focus

import com.android.tools.preview.PreviewDisplaySettings
import kotlinx.collections.immutable.ImmutableSet
import kotlinx.collections.immutable.toImmutableSet

/** A key for each element in [FocusModeTabs]. */
interface FocusKey {
  /** A [PreviewDisplaySettings] corresponding to this [FocusKey]. */
  val settings: PreviewDisplaySettings
}

/** Find organizationGroups for target list of [FocusKey], each group should have size > 1. */
fun Collection<FocusKey>.findOrganizationGroups(): ImmutableSet<String> =
  this.mapNotNull { it.settings.organizationGroup }
    .groupingBy { it }
    .eachCount()
    .filterValues { count -> count > 1 }
    .map { it.key }
    .toImmutableSet()
